Ounces (oz) to Kilograms (kg) conversion

Ounces to Kilograms conversion table

Ounces (oz)Kilograms (kg)
00
10.028349523125
20.05669904625
30.085048569375
40.1133980925
50.141747615625
60.17009713875
70.198446661875
80.226796185
90.255145708125
100.28349523125
200.5669904625
300.85048569375
401.133980925
501.41747615625
601.7009713875
701.98446661875
802.26796185
902.55145708125
1002.8349523125
100028.349523125

How to convert ounces to kilograms?

Converting between ounces (oz) and kilograms (kg) is a common task, especially in cooking, shipping, and international trade. Here's how to do it:

Conversion Factor

The key to converting between ounces and kilograms is knowing the conversion factor:

  • 1 ounce (oz) is approximately equal to 0.0283495 kilograms (kg)
  • 1 kilogram (kg) is approximately equal to 35.274 ounces (oz)

Converting Ounces to Kilograms

To convert ounces to kilograms, multiply the number of ounces by the conversion factor 0.0283495.

Formula:

Kilograms=Ounces×0.0283495Kilograms = Ounces \times 0.0283495

Example: Convert 1 ounce to kilograms

1 oz×0.0283495=0.0283495 kg1 \text{ oz} \times 0.0283495 = 0.0283495 \text{ kg}

Therefore, 1 ounce is equal to approximately 0.0283495 kilograms.

Converting Kilograms to Ounces

To convert kilograms to ounces, multiply the number of kilograms by the conversion factor 35.274.

Formula:

Ounces=Kilograms×35.274Ounces = Kilograms \times 35.274

Example: Convert 1 kilogram to ounces

1 kg×35.274=35.274 oz1 \text{ kg} \times 35.274 = 35.274 \text{ oz}

Therefore, 1 kilogram is equal to approximately 35.274 ounces.

Step-by-Step Conversion

Here's a summarized, step-by-step process:

  1. Identify the value you want to convert (either in ounces or kilograms).
  2. Choose the appropriate conversion factor (0.0283495 for oz to kg, or 35.274 for kg to oz).
  3. Multiply the value by the chosen conversion factor.
  4. The result is the equivalent value in the other unit of measurement.

Interesting Facts and Historical Context

The ounce has a long history, dating back to ancient Rome. There are different types of ounces (e.g., avoirdupois, troy, fluid), but for mass, we generally refer to the avoirdupois ounce, which is defined as exactly 28.349523125 grams. The kilogram, on the other hand, is the base unit of mass in the metric system, which is widely used around the world. The kilogram was originally defined as the mass of 1 liter of water.

The Importance of Standard Units:

Having standard units of measurement is crucial for trade, science, and engineering. The establishment and maintenance of these standards are managed by organizations like the International Bureau of Weights and Measures (https://www.bipm.org/).

Real-World Examples

Here are some common scenarios where you might convert between ounces and kilograms:

  1. Shipping: When sending packages internationally, shipping companies often use kilograms for weight, while you might know the weight of items in ounces.

    • Example: A package weighing 48 ounces is being shipped. What is the weight in kg? 48 oz×0.0283495=1.360776 kg48 \text{ oz} \times 0.0283495 = 1.360776 \text{ kg}
  2. Cooking: Many recipes, especially in the US, use ounces for ingredients, while others (or nutritional information) might use grams or kilograms.

    • Example: A recipe calls for 8 ounces of flour. How many kg of flour do you need? 8 oz×0.0283495=0.226796 kg8 \text{ oz} \times 0.0283495 = 0.226796 \text{ kg}
  3. Purchasing Goods: When purchasing goods internationally in bulk, the weight is often denoted in Kilograms instead of Ounces.

    • Example: A seller is selling 160 Ounces of product. How many kg is that? 160 oz×0.0283495=4.53592 kg160 \text{ oz} \times 0.0283495 = 4.53592 \text{ kg}

See below section for step by step unit conversion with formulas and explanations. Please refer to the table below for a list of all the Kilograms to other unit conversions.

What is Ounces?

The ounce (symbol: oz) is a unit of mass in the imperial and United States customary systems of measurement. It's commonly used for measuring weight, but it's essential to distinguish between weight and mass. Mass refers to the amount of matter in an object, while weight is the force exerted on that mass by gravity.

Types of Ounces

There are different types of ounces, the most common being the avoirdupois ounce and the troy ounce.

  • Avoirdupois Ounce: Used for everyday measurements of food, household items, and other general goods.

    • 1 avoirdupois ounce is equal to approximately 28.3495 grams.
    • 16 avoirdupois ounces make up one avoirdupois pound.
  • Troy Ounce: Primarily used for measuring precious metals like gold, silver, and platinum.

    • 1 troy ounce is equal to approximately 31.1035 grams.
    • 12 troy ounces make up one troy pound.

It is important to note that one pound of troy is lighter than one pound of avoirdupois since there are less ounces to make it. One troy pound = 373.24 grams and One pound of avoirdupois is equal to approximately 453.592 grams.

How Ounces Came to Be

The term "ounce" has ancient roots, derived from the Roman term "uncia," which meant one-twelfth. This referred to one-twelfth of a Roman pound (libra). Over time, this unit evolved and was adopted into various measurement systems across Europe.

Notable Connections

While no specific law or person is directly tied to the "ounce" itself, its historical significance is linked to commerce, trade, and the standardization of weights and measures. Standardized measurement played a crucial role in the development of science.

Real-World Examples

  • Food: A standard can of soda often contains 12 fluid ounces.
  • Baking: Recipes frequently call for ingredients measured in ounces (e.g., 4 ounces of butter).
  • Precious Metals: Gold and silver are priced and traded by the troy ounce on global markets.
  • Shipping: Small packages are often weighed in ounces for determining shipping costs.

Ounce Conversion Formulas

To convert ounces (oz) to grams (g):

grams=ounces28.3495grams = ounces * 28.3495

To convert grams (g) to ounces (oz):

ounces=grams/28.3495ounces = grams / 28.3495

What is Kilograms?

Kilogram (kg) is the base unit of mass in the International System of Units (SI). It is a fundamental unit used to measure the amount of matter in an object. Unlike units like length or time, the kilogram's definition has historically been tied to a physical artifact.

Defining the Kilogram: From Artifact to Fundamental Constant

The IPK: A Piece of Platinum-Iridium

For over a century, the kilogram was defined by the International Prototype Kilogram (IPK), a platinum-iridium cylinder stored at the International Bureau of Weights and Measures (BIPM) in France. This meant that the mass of every kilogram in the world was traceable back to this single object.

The Problem with the Artifact

The IPK was not a perfect standard. Over time, it was observed to have changed mass slightly compared to its official copies. This instability, however small, was a major concern for scientific measurements that require utmost precision.

The New Definition: Based on Planck's Constant

On May 20, 2019, the kilogram was redefined based on fundamental constants of nature. The new definition is linked to the Planck constant (hh), a cornerstone of quantum mechanics. The Planck constant has a fixed numerical value when expressed in SI units:

h=6.62607015×1034kgm2s1h = 6.62607015 × 10^{-34} kg⋅m^2⋅s^{-1}

By fixing the value of hh, scientists can realize the kilogram through experiments involving quantum phenomena. This change provides a far more stable and reproducible definition than relying on a physical object. The experiment that is commonly used to realize the kilogram based on Planck's constant is called a Kibble balance.

Mass vs. Weight

It's important to distinguish between mass and weight. Mass (measured in kilograms) is the amount of matter in an object, while weight is the force exerted on that object due to gravity. Weight is measured in Newtons (N). The relationship between mass and weight is:

Weight=mass×gravityWeight = mass × gravity or W=mgW = mg

Where:

  • WW is weight (in Newtons)
  • mm is mass (in kilograms)
  • gg is the acceleration due to gravity (approximately 9.81 m/s2m/s^2 on Earth's surface)

Kilograms in Everyday Life: Examples

  • Food: Groceries are often sold by the kilogram, such as fruits, vegetables, and meat.
  • Human Body Weight: People often measure their body mass in kilograms.
  • Construction Materials: Cement, sand, and other building materials are often bought and sold by the kilogram or metric ton (1000 kg).
  • Shipping and Logistics: The weight of packages and cargo is a crucial factor in shipping costs and logistics.

Interesting Facts

  • Prefixes: Kilogram is unique in that it's the only SI base unit with a prefix already in its name ("kilo," meaning 1000).
  • The Kibble Balance: The Kibble balance (also known as a watt balance) is the instrument used to realize the new definition of the kilogram by linking mass to the Planck constant. For more information, you can read about the NIST's Kibble Balance.

Complete Ounces conversion table

Enter # of Ounces
Convert 1 oz to other unitsResult
Ounces to Micrograms (oz to mcg)28349523.125
Ounces to Milligrams (oz to mg)28349.523125
Ounces to Grams (oz to g)28.349523125
Ounces to Kilograms (oz to kg)0.028349523125
Ounces to Metric Tonnes (oz to mt)0.000028349523125
Ounces to Pounds (oz to lb)0.0625
Ounces to Stones (oz to st)0.004464285714286
Ounces to Tons (oz to t)0.00003125